FILE - In this July 9, 2012 file photograph made using a long exposure, traffic moves along Interstate 75 against the downtown skyline in Atlanta. We're heavier in pounds and hotter by degrees than Americans of old. We're starting to snub our noses at distant suburbs after generations of burbs in our blood. Our roads and bridges are kind of a mess. There are many more poor, and that's almost sure to get worse. The average commuter wasted 14 hours stuck in traffic in 1982, 39 hours in 2005 and 34 hours in 2010, says the Texas Transportation Institute. (AP Photo/David Goldman, File)

Associated Press
FILE - In this July 9, 2012 file photograph made using a long exposure, traffic moves along Interstate 75 against the downtown skyline in Atlanta. We're heavier in pounds and hotter by degrees than Americans of old. We're starting to snub our noses at distant suburbs after generations of burbs in our blood. Our roads and bridges are kind of a mess. There are many more poor, and that's almost sure to get worse. The average commuter wasted 14 hours stuck in traffic in 1982, 39 hours in 2005 and 34 hours in 2010, says the Texas Transportation Institute. (AP Photo/David Goldman, File)
FILE - In this July 9, 2012 file photograph made using a long exposure, traffic moves along Interstate 75 against the downtown skyline in Atlanta. We're heavier in pounds and hotter by degrees than Americans of old. We're starting to snub our noses at distant suburbs after generations of burbs in our blood. Our roads and bridges are kind of a mess. There are many more poor, and that's almost sure to get worse. The average commuter wasted 14 hours stuck in traffic in 1982, 39 hours in 2005 and 34 hours in 2010, says the Texas Transportation Institute. (AP Photo/David Goldman, File)
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